Chapter 24 The Telescope of the Rocky Mountains On the 20th of October in the preceding year, after the close of the subscription, the president of the Gun Club had credited the Observatory of Cambridge with the necessary sums for the construction of a gigantic optical instrument. This instrument was designed for the purpose of rendering visible on the sur-face of the moon any object exceeding nine feet in diameter. At the period when the Gun Club essayed their great experi-ment, such instruments had reached a high degree of perfec-tion, and produced some magnificent results. Two telescopes in particular, at